Keyhole-guard



L. R. CULVER.

KEYHOLE GUARD.

APPLICATION FILED FEB. 15. 1921.

1,392,404, I v Patented'Oct. 4,1921.

my T 25 l I I I l I I I conveniently 'ca'rriedby 1 of releasing piece;

' Freeman-amen To all whom awa amen; e

Be'it known that 'I, LAGA'R Ruhr; Cumin, a citizen 'of the United States, residing at Portland, in the county ofMuItnomah and State'of Oregon, have invented certain new and 'usefufl Improvements in- Keyhole- Guards, of which the following isja 'speoifi} cation. r V My invention relate'sftoimprovements in keyhole guards, and which are tobe'usedin conjunction with the-ordina' "or common door guard, and the objects'o' my improvement are, first,- to provide a detachablelock that will effectually stop the use of a skeleton; or pass-key to operate the comm'on" lock on the door to which i' isapplied; second, to provide a guard which can readily be applied to, andremov'ed fromithe ordinary doori lock without defacing the door or caslIlg;tlllId, to provide a guardthat 'oan'be 'appers'o'n traveling,

and quickly applied to the 'door of hotel or rooming-house in which he. may stop, there; 'byxproviding-a safe lockfupon the door of hisroom 1 Y My inventionconsists of an auxiliary look which is 'to -be detachbly fastened onand used in conjunction with the common lock on the-door,andconsistsiof arba'se or main' plate 1 by which my invention is attached to; the common lock, and the-other parts 0 .my' invention-such asthe tumblers, "bolts and key used in connection with the key hole, bolts and parts oithe common look to make it impossible to'ope'rate the bolts of the common lock-until the tumblers, bolts and other parts-of "my auxiliary lock are first operated. V

I attainthese objects by-th'e mechanism illustrated in the accompanying drawing, in which similar numerals and letters indicate likezparts' throug out the several views. Figure 1 is a front elevation of my guard with its cover plate'16 removed; Fig. 2, is averticall section, cut on line 2-2, of Fig. 1, and shows the guard in place on a .door, which is also shown fin'sectio'n; Fig. 3,

jis'an inverted pla'n view of 'my guard with the bottom housing plate 15 removed to show the position of the levers and the arm Fig. 4, is an enlarged view of the bolt mechanism, looking at right side ,with .part of the cover plate 16 cut away to show the. relative positions of springs andthe carrying pin; Fig. 5,'is an enlarged perspective view' of the latch bolt,

i Specification'of Letters Patent;

Application filed Ieln'ugn'y 15, 1921 slot; The latch f 14, bottom plate I the STATES; PATENT OFFICE.

Lineman. ounvER, or Peivrmmn,1onneon. H

' Patented'Oc'tt 4,1921. salut -44 ,079,

latch plate, releasing mem er and one or the leversior -tumblers, separated to give a clear view Fig. '6, is'an' enlarged perspec,- tive viewof thebolt' which is to be inserted the keyhole of doo rtohold my lock in placeg'and to prevent its moving when the door-knob is turned-. I

g The 'saidbase plate 1--ismade long enough to reach from above the knob spindle 5 and extends below the key-hole o fjthe common 'lock, fandhasa circular opening 1 cut in one end portion. Two circula'r'disks 2 are fastened' together-and within said Opening "1 *b y the rivets '3, andeachqdisk has a concentric portion 'str'uc'kinor cupped toward the other diskso "they will revolve freely within said opening "1 and withothe r portions bearing against the faces of'said plate 1.

- The square hole 1in each of -said' disks ,2 is to receive the main square spindle 5 of the door lockon which it' is applied.

The elongated slots 6 are provided in the plate-1 and'disks 2'to receive a'l'atch bolt 7 which slides up'and down freely infs'aid bolt *7 is bent to the left at .pr'a'cticallyrig'ht angles asshown in Fig. 1 and extends down through the "locking m'eohanism'; I

M auxiliary "lock is incasedv in a' housing 'front plate 16, top plate 15:, with its end portions bentat'fright angles to form the'end plates, and the back plates '13 which are slidably hookedaround the edgesof said plate 1. The said plates 13,1 1, 15, and 16 are held together and gaging in slots 40 of thedifierent plates and riveted. to hold the housing together, see "Fig. 3. The said housing carries the other consisting of the elements of 'my device and is movable up in. bo'x' form by the lugs 41 enanddown on the 'platel in order that the i arm of the 1bolt7 may be'en'gaged in the slots 6- of the disks2 "to keep the knob spindle-5 from turning.

The bolt -.7 has a plurality ofrat'chet teeth 8:to now for adjustment "on different doors where key holes are not the samedistance apart and are for the purpose of latching the bolt 7 in the slots 6 to hold the disks 2 from turning. .The slot 10 with .the enlarged portion 9 is 'cutin said plate to receive and hold bolt 11. Y The bolt 11 is for the purpose of holding the aukiliary lock inplace and keep it from turning when the latch bolt 7 is engaged with thedisks 2 and is made of two 'metal blanks welded together. The

the key hole of the door. Openings 42 are cut through the front plate 16 and'plate 1, to receive the T-shaped members 33 and bolt 11, and plate 16 is slotted toreceive the finger lugs 28 and The said T-shaped members 33 are placed'contiguousthe'sides v of the bolt 11 and are to strengthen thelock and hold the housing against the plate 1 as guides forsaid bolt 11 through said openings 42150 adjust my auxiliary lock-to doors thicknesses, the form of said v of different T-shaped members may be seen in Fig. 3. A

14 and 15, and acts as a bearing for'tthe levers or tumblers 17, six of which are shown. Each of notch or slot 18 cut in its end portion to form the different combinations which are possible in my lock, and other similar slots may be cut in said'tumblers if'desiredr I provide a bolt engaging member or plate 24, with a narrowed extension 31 on one end, and a beveled notch or shoulder 27 011 one side edge. A lug 23 extends outwardly on the end of plate 24 opposite said extension 31; Aspring 26 ,thatis adjacent to'said pin 30, has one end fastened in said plate 24, while'its other end is offset to engage in a notch 257 f another member'21. @The said member 21 is the release member of my auxiliary lock and is made of plate material bent into the desired sha e,.'and consists ofa flat plate portion which ies contiguous said plate 24,.and has two notches cutout of one as 25, while the other is shown, at '27 and "is similar: tothe corner cut out of? plate .24, which is beveled in -that plate and shown a's 27, and in this plate 21 allows the bolt 7 to 7 move therein. =Oppositesaid'notch 27 a portion of said plate 21 is bent-at right angles and shown'at 20, while near the other end of member 21 a portion thereof is bent at right angles and then upon itself again at right angles and parallel with the'main portionof member 21, marked in Fig. 5, as 21K The said portion 2lahas a recess- 43 cut therein similar to and in alinement with v the notch 25 of said plate 21. Another notch or recess 39 is cut in said "portion 21" in valinement with an elongated slot'38 which iscut in the main-portion 21'. The notch 39 and slot 38 receive the said pin 30'. A

- portion of the end of. said member21 is extended as the finger lug 28 whereby the memgitudinally and thereby ber 21 is moved ,lon v disengaged from the the member 20 is notches '1-8 of the leverf tumblersil7. 'The lever tumblers '17 are fiat plates each of which is carried on said pin 30 and each has its individual spring 291 fastened in:one end portion, andeach isslottedas stated-above 'ing its end nesses of doors, and the arm 44 engages in fblers 17 in the position that the said said tumblers 17 has a a from the outside.

edge,- one of'w'hich has been mentioned above, for: movement of piece 21 in relation to 24 fits into notch 25 of as'at 18. I

recessed to contact respectively with; the individual lever tumblers 17 and move them on their common pin 30, and on the other end of saidkey, is formed a screw driver 36 used to remove the holding screw '34 of-the said shaft 5.11 provide a spring provide a pressure key 19 hav- I 22 whi chis carriedon said pin 30 with one end bent at right angles to engage in the recess 43 of the plate 21, while-.theother end a,

bears against the-said plate 16,v see Fig. 4. The tension of holdssaid plate 21 so that the portion 20 will .engage thelever tumblers 17 ,within J: 4 v their respective notches 18. The tension of bar or pin 30 1S fastened 1n the said plates said spring. 22 normally the springs 29 normally holdsaid lever tum- 20 (will not enter the slots;,18.

loekhousing is slid upuntil the bolt-11 is in theenlarged portion 9 of slot10, whenthe bolt. 11' can be adjusted for different thicknesses of doors; by moving said bolt longitudinally, the lock housing is then slid down lock, then the screw 34 ofdoor knob isrei moved and the shaft 5 withdrawmthe sleeve 35 puton and shaft partly entered-,next the lock is turned and slid up or downuntil: the square shaft 5 will enter the hole .4, the'door knob is then put. on and screw .34 is replaced; The sleeve 35;is' for thelpurpose of keeping the screw. 37 from being removed -'The slots 38 and 39 allow pin 30.'

18 come in line with the portion 20 of the releasing piece 21 the" spring '22 will' -move'said piece 21 with the portion 20 to the right into the notches 18, and as the lug 23 of plate piece 211 and is held to the left side of notch 25 by thespring 26 fitting into thesaid notch 25, the'latch plate portion 1 To attach my auxiliarylock to. a d Qi-j t I.

24 will also be carried or moved to the right with piece 21, and the" beveled notch 27--of plate 24 willbe withdrawn from teeth 8 of bolt 7 and said bolt 7 :will drop down of its own weight, the "door knob can then be turned and'the door opened from the outside.

When a is desired to lock the door-with my auxiliary lock the "piece21 is'press'ed to the left by pushingon thefinger lug 28 thereby shoving arm 20 out'of the'notches 125 18' of levers 17, the springs 29 will'return them to their normal locked position, the bolt 7: 1s then pulled up into the slots: 6of

disks2and the bevelednotch' 27 of plate 24 will hold it there until released. v

'I" aware that door locks are made 'where the door knob is locked from being 1. In an auxiliary lock for a door the com bination With a door-lock having a knob spindle and a key hole, of a platehaving a circular opening cut in one end portion, an slots in'the other end portion; bearing disks having a square hole centrally therein and radially slotted and mounted for partial rotation in said opening of said plate; having an arm thereon adapted to engage in the radial slot of said disksgand with a ratchet rack in one edge; a housing slidable on said plate; a bolt engaging plate carried in said housing and movable longitudinally for engagement with or release from the ratchet rack of said bolt a lug on said plate adapted to engage a contiguous plate; a release plate also carried in said housing and having a recess therein to receive the lug on the bolt engaging plate; a portion of said release plate bent parallel thereto and having slots out in its'edges; another portion bent at right angles to the main portion and adapted to engage lever tumblers; lever tumblers carried in said housing having a slot in the end portion of each; a spring on each of said lever tumblers; and a'key to move them against the tension of said springs. 1

a bolt signature.

2. In an auxiliary lock for a door the combination with a door-lock having a knob spindle and a key hole, of a plate having a circular opening out in one end portion, and a slot in the other end portion; bearing disks having a square hole centrally therein and radially slotted and mounted for partial rotation in said opening of said plate; a bolt having an arm thereon adapted to engage d inthedoor lock through the key hole; an-

other bolt having an arm thereon, adapted to engage in the radial slot of said disks, and with a ratchet rack in one-edge; a housing slidable on said plate; a bolt engaging plate carried in said housing and movable longitudinally for engagement with or release from the ratchet rack of said bolt a lug on said plate adapted to engage a contiguous plate; a release plate also carried in said housing and having a recess therein to receive the lug on the bolt engaging plate; a portion of said release plate bent parallel thereto and having slots cut in its edges; anotherportion bent at right angles to the main portion and adapted to engage lever tumblers; lever tumblers carried in said housing having a slot in the end portion of each; a spring on each of said lever tumblers; and a key to move them against the tension of said springs.

In testimony whereof I have afiixed my LAGAR R. CULVER. 

